Regress Olympia on MacOS

[kathlenemagnus]

Expanding the Olympia regression to build and run on MacOS-12. I'm not sure if a separate Conda env file is necessary. Testing it with conda/environment.yml to start.

[kathlenemagnus]

So it looks like there are a lot of libraries in conda/environment.yml that are not available with the macos-12 runner image. I'll need to create a separate Conda env yml and figure out library versions are available: https://github.com/actions/runner-images/blob/main/images/macos/macos-12-Readme.md

[kathlenemagnus]

Current failure:

ld: library not found for -lyaml-cpp

[phattso]

Running into the same missing yaml-cpp library issue at link time

[phattso]

Success!
Looks like limiting yaml-cpp to v0.7 instead of the latest v0.8 seems to have done the trick